/Engine/Plugins/Online/OnlineServicesOSSAdapter/Source/Public/Online/ErrorsOSSAdapter.h
If you would like to add a parser that transforms custom platform errors into readable online service types, you can call this in your platform's error handler
typedef [TUniqueFunction](API\Runtime\Core\Templates\TUniqueFunction)< [TOptional](API\Runtime\Core\IO\TOptional)< [FOnlineError](API\Plugins\OnlineServicesInterface\Online\FOnlineError) >(const [FOnlineError](API\Plugins\OnlineServicesInterface\Online\FOnlineError) &, const [FOnlineErrorOss](API\Plugins\OnlineServicesOSSAdapter\Online\FOnlineErrorOss) &)> TOssPlatformErrorHandler